linux-kernel - Re: [PATCH] ARM: fix bug which lowmem size is limited to 760MB

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Message-ID: <1713935.2YV1sNJUyb@wuerfel>
Date:	Mon, 07 Sep 2015 13:41:33 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Yongtaek Lee <ytk.lee@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: fix bug which lowmem size is limited to 760MB

On Thursday 03 September 2015 21:24:00 Nicolas Pitre wrote:
> If 768MB targets were common place then it could be worth changing the 
> default vmalloc size to accommodate this memory size and testing all the 
> other targets to make sure no regressions are introduced.  But given it 
> is easy to change the default via the kernel cmdline, and that you lose 
> only 8 MB otherwise, I don't think it is worth the trouble and/or the 
> risk.

Agreed.

Given how much more common 1GB hardware configurations are compared to 768MB
configuration, we could however think about adding a VMSPLIT_3G_OPT option
that x86 has (also VMSPLIT_2_75G on ARCH_TILE), to allow using the entire
1GB of lowmem without going all the way to VMSPLIT_2G. That option would
also let us use the entire 768MB on the machines that 	Yongtaek Lee is
interested in.

	Arnd
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